verb. ['ˌɪnˈtɛnsɪˌfaɪ'] increase in extent or intensity.
verb. ['ˌɪnˈtɛnsɪˌfaɪ'] become more intense.
verb. ['ˌɪnˈtɛnsɪˌfaɪ'] make more intense, stronger, or more marked.
verb. ['ˌɪnˈtɛnsɪˌfaɪ'] make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark.